Hydraulic drive mechanism



Sept. 2 6, 1939. F. BARNEY HYDRAumc DRIVE MrscmuusmA Filed Dec. 20,195'? 3 Sheets-Sheet 1 Sept. 26, 1939. F. BARNEY 2,`173,817

HYDRAULIC DRIVE MECHANISM Filed Dec. 20, 1937 3 Sheets-.Sheet 5 A f l l'Humm @sa m.

Patented Sept. 26, 1939 UNITED STATES PATENT OFFICE The ChallengeAMachinery Uompany, `Grand Haven, Mich., a corporation of MichiganApplication December 20, 1937, Serial No. 180,818

9 Claims.

This invention relates to paper drilling machines and is concerned witha novel hydraulically operated mechanism fory moving a paper drill,

downwardly into drilling relation with the paper which it is to drill,the controlv of such mechanism being through a manually operatedinstrumentality, sucli as a foot pedal or an equivalent thereof, wherebythe pressure required to force the drill downwardly through the paperwhich is mon heretofore; for the operator to supply the force orpressure to the drill.

The invention is concerned with novel co structions, combinations andoperative arrangements of parts to eiectively attain the` power feed` ofthe drill to the paper. In addition many other objects and purposes willappeal, among which is a`regulation of the speed of the drilling 20.movement with relation to the paper which is drilled, and an automaticstopping of the drilling feed and return of the drill to initialpositionwhen a paper drilling operation is completed, or to stop thedrill lat any point in its downward course by releasing the pressure onfoot pedal 42. The drill will then return to initial positionautomatically, all of which may be understood from the followingdescription, taken in connection with the accompanying drawings, inwhich:

machine to which my invention is applied.

Fig, 2 is a fragmentary side elevation of the hydraulic mechanism whichis mounted in the lower part of an enclosing cabinet, said cabinet'being shown in vertical section. A

Fig. 3 is a fragmentary longitudinal vertical section through thehydraulic mechanism shown in Fig. 2.

Fig. 4 is a horizontal sectiontherethrough.

Fig. 5 is a fragmentary side elevation, similar to Fig. 2, showing theparts of the machine in a different position, and

Fig. 6 `is an enlarged partial elevation an 55 is carried on andabove acabinet or` casing 4 /drilled is readily and easily applied and con- 4trolled and it is not necessary, as has been comf Fig. 1 is a sideelevation of a paper drilling within which the hydraulic mechanism forfeeding the drill downwardly is housed. y

In the construction of the 'drilling machine two vertical posts 5 aremounted to extend through the support 3 and into thel cabinet'4, saidposts 5 being normally held in an upper position by coiled compressionsprings 6 which are compressed on downward movement of the posts duringthe drilling operation. A head 1 is adjustably mounted by means of splitsleeves 8 which may be 10 clamped on the posts 5 at any position towhich adjusted. I'I'his head carries an electric motor 9 which through abelt indicated in dotted lines at III drives a vertically positionedrotatable spindle II, at the lower end of which the paper drill I2 l5 isdetachably connected. The drill is a hollow drill and is positioned withreference to the back gauge 2 so that it will come a short distance infront of the face of the gauge against which the paper engages.I lInpractice the back gauge is 20 adjustable to different positions on thetable I to controlthe distance that the holes .drilled in the paper arefrom the back edges of the sheets of paper.

The posts 5 are connected 'at their lower end by 25 a cross bar I3which, at one end, has a short extension I4 (Fig. 4). I A vertical rodI5 is' threaded through the extension I4 and may be locked by thelcknutv shown in any position to which it may be adjusted. The cross bar-I3'lies 30 above the inner end of an oil containing tank I5, the innerchamber I'I of which is partly lled with oil to provide a reservoir ofoil for the hydraulic operation which will be later described.

The tank has an open upper end covered by a 35 removable cover. At itsrear portion a vertical cylinder AI8 is cast integral withthe tank I6,the I upper end' being closed by a closing head I9 in which a suitablestuffing box is installed and through which a piston rod passes, havinga 40 piston 2I at its lower end within the cylinder I8, and at its upperend having a connection to the bar I3 substantially midway between theposts 5.

A rotary pump 22 is mounted to one side and adjacent the front of the'tank IB and has an 45 inlet conduit 23 connecting its intake side withy/the tank IIi adjacent the bottom of said tank (Fig. 3). From theoutlet side of the pump a conduit 24 leads to the upper end portion ofthe cylinder I8, emptying as at 25 (Fig. 3), into said cylinder 50 abovethe piston 2I. Likewise', above the piston and connected with thecylinder I8 is a nipple 26 connected with a relief valve 21 which is`.connected by a suitable nipple with a coupling 28. The outer end ofthe coupling has a valve member 29 of substantially cylindrical formconnected therewith and extending outwardly therefrom, to the end ofwhich is an outlet 30 having a central passage therethrough.

The valve member 29 between its ends is provided with a transversepartition 3|. At one side of the partition toward the coupling 28 holesV32 are made through the wall of the valve member, and similar holes 33are made through said walls at the opposite side of the partition 3|(Fig. 6). Surrounding the valve member 29 is a housing made up of twosleeves 34 and 35 one threading into` the other, said sleeves havinginturned annular flanges at their outer ends so that the body of thehousing made by the connected sleeves is spaced from the outer sides ofthe valve member 29. Within the housing at each end thereof so as tobear against said annular flanges are packing rings 36 and 31, which areheld against said anges by a coiled compression spring 38 between thepacking rings. Trunnions 39 are connected with the member 34 and extendin opposite directions therefrom. A relatively heavy coiled compressionspring 40 at one end bears against the endof the member 34 tending 'topush it and the connected member to the left (Fig. 6), the opposite endof the spring bearing against an annular collar of the coupling 28.

A lever 4| having a foot pedal 42 at its outer end, said pedal beinglocated at the front of the cabinet 4 and near the bottom thereof, ispivotally mounted at its inner end toturn about a pivot rod 43. On suchpivotal movement of the pedal in a downward direction it swings theupwardly extending arm 44 in a counterclockwise direction. A squareblock 45 (Fig. 5) is carried at the upper end of the arm 44. A coiledspring 46 associated with the arm and the pedal 4| normally tends tolift the pedal to the upper position shown in Figs. 1 and 2.

A shaft 41 extends through the tank I 6 and is journaled for rotativemovement in the sides of the tank. Within the tank arms 48 secured tothe shaft extend upwardly and at their upper end portions are recessedor slotted to receive the trunnions 39 (Fig. 5). At the outer end of theshaft 41 and between the tank I6 and a side of the cabinet 4 an arm 49is secured extending downwardly and at its lower end having a pivotalconnection to the rear end of a bar 50. The ba-r 50 extends in a forwarddirection over the block 45 previously described. Said bar 50 in frontof the block 45 is provided with a hardened block 5| at its undersideagainst which the block 45 engages on depressing the pedal 42; therebymoving the bar 50 longitudinally in a forward direction, turning theshaft 41 and moving the valve housing comprised of the parts 34 and 35rearwardly or to the right (Fig. 6), whereupon the packing at 36 coversthe openings 33.

The pump 22 is driven by an electric motor 52 which through a series ofbelts 53 and reducing pulleys 54 drives the pump at a less speed thanthe speed of rotation of the motor.

A lever 55 is pivotally mounted at 56 between its ends on a side of thetank I6, the rear end of the lever extending to and coming directlybeneath the lower end of the vertical rod I5. 'Ihe front end of saidlever extends alongside the bar 50 to a position in frontl of the block5| and has a lateral projection 51 which comes underneath the front freeend of said bar 50 (Figs. 4 and 5).

When the machine is to be usedfor drilling paper, the sheets of paper tobe drilled usually in a superimposed pack are placed on the table I andagainst the back gauge 2; and usually an end gauge, not shown in thepresent disclosure, is used to gauge the sheets at one of the side edgesthereof. Preparatory to drilling the electric motor 52 is started inoperation. It pumps oil, taking it from the chamber I1 of the tank I6throughvthe inlet pipe 23, and delivers it to the cylinder I8 above thepiston. So long as the pedal 42 is not depressed the oil pumped into thepiston is carried out through the nipple 26, through valve 21, coupling28 and into the valve member 29, passing outwardly through the openings32 and then back into the valve member through the openings 33 and outat the outlet 30.

When the pedal 42 is depressed and the packing at 36 covers the openingsat 33 in the valve member 29, there is no place for the oil to go exceptinto the cylinder I8, whereupon the oil pumped into the cylinder abovethe piston `2| causes a pressure upon the upper side of the piston,moving it downward and thereupon bringing the drill I2 into drillingrelation with the paper. The downward movement of the piston 2|continues, so long as oil isy pumped into the cylinder I8 above thepiston and cannot escape until the lower end of the rod I5 engages thelever 55 and turns it in a clockwise direction. Such movement elevatesthe `projection 51 with a consequent elevation of the outer end of thebar 50 and disengagement of the block 5I from the-block 45. When thisoccurs the spring 40 moves the outer housing consisting of parts 34 and35 back to the initial position shown in Fig. 6. This restores thecirculation of oil through the openings 32 and 33. The springs 6elevate. the posts 5 and the drill I2 and force the oil which is abovethe piston outwardly and into the tank I6, as is` evident. 'Ihe valvecontrol of the flow of oll through the openings 33 is operatedsubstantially instantaneously so that when the drill has completed adrilling operation and reached the lower limit of the travel which itshould make it is stopped substantially instantly and started on itsreturn to upper position as the rod I5 operates vthe lever 55 and stopsany further downward movement of the piston 2|.

The speed of downward movement of the piston Y 2|, posts 5 and the drillmay be regulated by setting the relief valve at 21. Such relief valve isof conventional structure. It may be set to permit a limited escape ofoil, but not the f-ull amount that is pumped into the cylinder I8. Suchvalve is accessible by removing the cover to the tank I5, whereupon therelief valve may be set for the desired downward drilling movement ofthe drill andthen the cover replaced. After the downward movement of thedrill has been stopped and it is returned to its upper position, it isnecessary to release the foot pedal to permit the block 45 to again comein front of the block 5I for the succeeding drilling operation.

With this structure the power moving the drill downwardly to and throughthe paper is supplied by the electric motor 52. The operator is not re-,quired to overcome the elevating springs 6 and force the drilldownwardly through the paper as has been common practice in manymachines heretofore. The operators use of the pedal is more in thenature of a trip to start the hydraulic mechanism in motion therebyrelieving him of the strain to which he was previously subjected. Speedof drilling and ease of operation is greatly enhanced.

One very desirable and important feature of the operation of the presentinvention is that the movement of the drill in drilling through thepaper may be stopped and automatically returned to initial positon atany time by releasing pressure on the pedal 42. On release of suchpressure Vthe forcing of oil into the cylinder I8 above the part of themachine, if the operator is injured,

if there is a breakage, and the like.

It is further to be understood that while the Y practical embodiment ofthis invention as disclosed in the drawings shows a vertical machine andthat at the present time is the best construetion that I know forembodying the invention, such invention is not to be limited necessarilyto vertical movements of the drill as it may be used equally as well onhorizontal machines.

The invention is dened in the appended claims and is to be consideredcomprehensive of all forms of structure coming within their scope.

I claim:

l. In a paper drilling machine, a support, a vertically positioned drillcarrying member movably mounted on said support for vertical movements,yielding means normally lifting said drill carrying member to an upperposition, a receptacle having a liquid receiving chamber therein, avertical cylinder located in said receptacle, a piston in said cylinder,connections between said piston and the lower end of the drill carryingmember, a pump, an inlet liquid conduit lfrom the chamber in saidreceptacle to the inlet side of the pump, an outlet conduit from theoutlet side of the pump to the upper part of said cylinder above saidpiston, a third conduit from the upper part of said cylinder and abovethe piston to said receptacle, a normally open valve in said thirdconduit, and pedal operated means for closing said valve, as and for thepurposes speciied.

2. In combination, a horizontal table upon which paper to be drilled isadapted to be placed, a vertically positioned rotatable paper drillabove said table, vertically movable means carrying said drill, meansnormally acting to lift said vertically movable means and drill to anupper position, hydraulic means including a continuously operating pumpfor pumping liquid, a cylinder, a piston therein above which liquid ispumped into said cylinder, a connection between said piston and saidvertically movable drill carrying means, a conduit between said pump andsaid cylinder, free outlet means for said liquid, and manually operablemeans for arresting the ilow of liquid through said outlet means andforcing it against said piston to cause a movement thereof said manuallyoperable means being operable at any mid-position of said drill torelease the ilow of liquid and, to thereby reverse the movement of saiddrillifrom such position.

3. A construction containing the elements in combination defined inclaim 1, combined with a vertical rod connected to and extending in adownward direction from said drill carrying member, a lever mountedbetween its ends for pivotal movement on said receptacle, one end ofsaid lever lying directly below the lower end of said rod, whereby saidlever is pivotally moved on downward movement oi the drill carryingmemberA to a predetermined position, and' means carried by said leverfor vfreeing said valve in the third conduit whereby it may move to openposition.

4. A paper drilling machine including, a support, a drill carryingmember mounted on said support for vertical movements, means forelevating the drill carrying member to an upper position, a receptacleadapted to hold a quantity of liquid, a vertical cylinder in saidreceptacle, a piston in the cylinder, connections between said pistonand the drill carrying member for moving said member with the piston, apump, means to drive the pump, an inlet conduit leading from saidvreceptacle to the inlet side of the pump, an outlet conduit leadingfrom,the outlet side of the pump to the upper part of the cylinder andabove the piston, a third conduit leading from the upper part of thepiston into said receptacle, a spring actuatedyalve normally held in anopen position in said conduit, foot operated means for moving said valveto closed position, and means operated by the drill carrying member whenit has reached a predetermined lower position for disengaging said valvefrom said foot operated means to permit the spring of the springactuated valve to return the valve to open position.

5. In a paper drilling machine, a support, a drill carrying membermounted on said support for vertical movements, means for elevating saiddrill carrying member to upper position, a receptacle for containing aquantity of liquid, a vertical cylinder in said receptacle, a piston inthe cylinder, a piston rod connecting the piston with said drillcarrying member, a pump, means for driving' said pump, an inletconduit-leading from said receptacle to the ,inlet side of the pump, asecond conduit leading from the outlet side of the pump to the upperpart of said-cylinder and above the piston, a third conduit within saidreceptacle extending from the upper portion of said cylinder and abovethe piston, a spring actuated valve in said third conduit, said valvebeing normally held by its spring in open position, a foot pedal, re-

leasable connections between said pedal and said valve, a depression ofsaid foot pedal moving the valve to closed position, a lever mountedbetween its ends on one side of the receptacle, a rod mounted on saiddrill carrying member adapted to engage the lever at one side of itspivot to turn the same when the drill carrying member has been moveddownwardly to a predetermined position, and means on the other end ofthe lever engageable with said releasable means for actuating the sameand disconnecting the valve from said pedal, as specied.

6. A paper drilling machine including, a support, a. drill carryingmember movably mounted thereon for vertical movements, spring meansnormally elevating said drill carrying member to an upper position, areceptacle adapted to` contain a quantity of liquid, a vertical cylinderin said receptacle, a piston in the cylinder, a piston rod connectionbetween the cylinder and the drill carrying member, a pump, means todrive the pump, a conduit connecting said receptacle and the inlet sideof the pump, a second conduit connecting the upper part of said cylinderat a point above the piston with the outlet side of the pump,

. a third conduit connected with the upper part of thecylinder above thepiston located in and emptying into said receptacle, a spring actuatedvvalve slidably mounted on said third conduit, in-

open position, a rockv shaft, connections between the rock shaft andvalve for moving the valve against said spring to closed position, anarm on the rock shaft, a bar connected to said arm hav- I ing a shoulderat its under edge and toward its move said valve to closed position, asand for the purposes described.

7. A construction containing the elements in combination dei-ined inclaim 6, combined with a lever pivotally mounted between its ends onsaid receptacle, a member attached to said drill carrying member andmovable therewith adapted to engage the lever at one side of its pivoton downward movement of the drill carrying member to a predeterminedlower position and a lateral prof. jection carried by said lever at theother side i' its pivot extendingunder said bar, whereby said bar islifted on pivotal movement of the lever to free said valve for return toclosed position.

8. In combination, a member against which paper to-be drilled may beplaced, a rotatable paper drill, movable means for carrying said drilltoward vand away from said member, yielding means normally acting tomove said drill carrying means away from said member, hydraulic meansincluding a cylinder, a piston therein, and a pump for pumping iiuid, aconnection between the piston and the movable drill carrying means,aconduit between said pump and said cylinder, free outlet means for saidiiuid, and manually operable means for stopping the flow of iluidthrough said outlet means and forcing it against said piston to therebymove the piston and connected drill carrying means.

9. In a paper drilling machine, a support, a drill carrying membermovably mounted on said support for vertical movements, means normallyelevating said drill carrying member to an upper position, a cylinder, apiston therein, a piston rod connecting said piston and said drillcarrying member, a pump, a receptacle for holding liquid, a conduitleading from said receptacle to the pump, from the pump to one end ofthe cylinder, andv from said cylinder to said receptacle, said conduitnormally being open for ilow of liquid, manually operable means forclosing said conduit between the receptacle and cylinder to force theliquid into the cylinder against a side of said piston to thereby movethe attached drill carrying apparatus in a downward direction, meansmounted on said drill carrying apparatus and moving therewith in adownward direction, and means operated thereby for automatically openingsaid conduit when the drill carrying apparatus has moved in a downwarddirection to a predetermined position.

FREEMAN BARNEY.

